nvidiafb: remove open_lock mutex

Remove mutex from the nvidiafb_open/nvidiafb_release functions as these
operations are mutexed at fb layer.
Signed-off-by: NAlessio Igor Bogani <abogani@texware.it>
Cc: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/nvidia/nv_type.h

@@ -5,7 +5,6 @@
 #include <linux/types.h>
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
-#include <linux/mutex.h>
 #include <video/vga.h>
 
 #define NV_ARCH_04  0x04
@@ -99,7 +98,6 @@ struct nvidia_par {
 	RIVA_HW_STATE initial_state;
 	RIVA_HW_STATE *CurrentState;
 	struct vgastate vgastate;
-	struct mutex open_lock;
 	u32 pseudo_palette[16];
 	struct pci_dev *pci_dev;
 	u32 Architecture;

drivers/video/nvidia/nvidia.c

@@ -1004,15 +1004,12 @@ static int nvidiafb_open(struct fb_info *info, int user)
 {
 	struct nvidia_par *par = info->par;
 
-	mutex_lock(&par->open_lock);
-
 	if (!par->open_count) {
 		save_vga_x86(par);
 		nvidia_save_vga(par, &par->initial_state);
 	}
 
 	par->open_count++;
-	mutex_unlock(&par->open_lock);
 	return 0;
 }
 
@@ -1021,8 +1018,6 @@ static int nvidiafb_release(struct fb_info *info, int user)
 	struct nvidia_par *par = info->par;
 	int err = 0;
 
-	mutex_lock(&par->open_lock);
-
 	if (!par->open_count) {
 		err = -EINVAL;
 		goto done;
@@ -1035,7 +1030,6 @@ static int nvidiafb_release(struct fb_info *info, int user)
 
 	par->open_count--;
 done:
-	mutex_unlock(&par->open_lock);
 	return err;
 }
 
@@ -1300,7 +1294,6 @@ static int __devinit nvidiafb_probe(struct pci_dev *pd,
 
 	par = info->par;
 	par->pci_dev = pd;
-	mutex_init(&par->open_lock);
 	info->pixmap.addr = kzalloc(8 * 1024, GFP_KERNEL);
 
 	if (info->pixmap.addr == NULL)